r/KananGill

I'm gonna blunt. I'm an American, and I need this explained to me. idk if it's the accent, and I should know what he's saying or if he's using a non-english word that I wouldn't know anyway. Can someone ELI5 what he's talking about here? https://youtu.be/ZYExH_mW-FA?t=1691

"If someone says ____ you can't say ____. It's a trap"